(PECL ds >= 1.0.0)
Ds\Map::ksort — Sorts the map in-place by key
Sorts the map in-place by key, using an optional comparator
function.
comparator
A função de comparação precisa retornar um inteiro menor, igual, ou maior que zero caso o primeiro argumento seja considerado respectivamente maior, igual ou maior que o segundo. Note que antes do PHP 7.0.0 este inteiro tinha de estar no intervalo de -2147483648 a 2147483647.
Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.
Não há valor retornado.
Exemplo #1 Ds\Map::ksort() example
<?php
$map = new \Ds\Map(["b" => 2, "c" => 3, "a" => 1]);
$map->ksort();
print_r($map);
?>
O exemplo acima irá imprimir algo similar à:
Ds\Map Object ( [0] => Ds\Pair Object ( [key] => a [value] => 1 ) [1] => Ds\Pair Object ( [key] => b [value] => 2 ) [2] => Ds\Pair Object ( [key] => c [value] => 3 ) )
Exemplo #2 Ds\Map::ksort() example using a comparator
<?php
$map = new \Ds\Map([1 => "x", 2 => "y", 0 => "z"]);
// Reverse
$map->ksort(function($a, $b) {
return $b <=> $a;
});
print_r($map);
?>
O exemplo acima irá imprimir algo similar à:
Ds\Map Object Ds\Map Object ( [0] => Ds\Pair Object ( [key] => 2 [value] => y ) [1] => Ds\Pair Object ( [key] => 1 [value] => x ) [2] => Ds\Pair Object ( [key] => 0 [value] => z ) )